2. The engine must be warmed up to normal operating temperature, the battery must be fully charged. The weight of the spark plug must be unscrewed (see chapter 1). In addition, you will need an assistant for this work.
3. Turn off the ignition system. To do this, disconnect the ignition coil connector or the ignition module connector. Also remove the #14 fuse to disconnect the fuel pump.
4. Install the compression tester in the spark plug hole of the 1st cylinder. A compression gauge that is screwed into the threaded hole of the spark plug is more preferable.
5. Ask the assistant to fully depress the accelerator pedal and turn on the starter. After one or two revolutions, the pressure in the cylinder should increase to a maximum, after which its value will stabilize. Record the maximum meter reading.
6. Repeat the test in all other cylinders, recording the pressure values in each of them.
7. Pressure readings in different cylinders must be close in magnitude and meet the specifications. Keep in mind that a healthy engine should build pressure quickly. Low pressure during the first stroke, followed by a gradual increase in subsequent strokes, indicates wear on the piston tracks. If the pressure is low after the first stroke and does not increase on subsequent strokes, this indicates leaks through the valves or through the head gasket (the reason for this may also be damage to the block head itself). The presence of deposits on the undersides of the valve heads can also cause low pressure.
8. If the pressure in one of the cylinders is reduced, perform an additional check to identify the cause of this. Pour a little clean oil into such a cylinder through the hole of the candle (about a teaspoon) and recheck. If a temporary increase in pressure occurs when oil is added, this indicates excessive cylinder or piston wear. If the pressure does not increase, then the cause may be leaks through burnt valves or through the head gasket.
9. Low pressure in two adjacent cylinders almost certainly indicates leakage through the gasket in the area between them. The presence of coolant in engine oil is a confirmation of this assumption.
10. At the end of the test, install the candles. Repair the connection between the ignition system and the fuel pump.
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